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ML2731CT Datenblatt(PDF) 1 Page - Micro Linear Corporation

Teilenummer ML2731CT
Bauteilbeschribung  PA Bias Controller
Download  12 Pages
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Hersteller  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML2731CT Datenblatt(HTML) 1 Page - Micro Linear Corporation

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January, 2000
PRELIMINARY DATASHEET
The ML2731 is a power amplifier (PA) bias controller with
support circuits for a typical radio transceiver. The IC
integrates a PA bias controller, a PA DC switch, a crystal
oscillator circuit, a negative voltage generator and two
voltage regulators. It can be used with GaAs FETs and
silicon bipolar devices.
Micro Linear’s ML2731, along with the ML2712 and the
ML2713, form a complete transceiver solution for the 2.4
GHz IEEE802.11 communication standard, as well as
other wireless ISM communication products.
In addition to supporting Micro Linear’s transceiver chip
set, the ML2731 can stand alone as:
A compact bias voltage controller
A compact negative voltage generator
A compact crystal oscillator
n Sets PA current and power output using a bias control
loop
n Integrates a PA DC supply switch
n Prevents PA power-on if negative voltage is not present
n Integrates all circuits needed for supporting a crystal
oscillator with 10MHz to 40MHz frequency range
n Incorporates a fast starting, high switching frequency,
negative voltage generator requiring only small
ceramic capacitors
n Contains voltage regulators for an oscillator, a negative
voltage generator and a 50mA 3.0V LDO output
n Requires less than 1mA of current when powered down
n Supply voltage ranges from 3.3V to 5.5V
GENERAL DESCRIPTION
ML2731 PA Bias Controller
FEATURES
SIMPLIFIED BLOCK DIAGRAM
APPLICATIONS
n Cellular and Cordless Radios
n WLAN Radios
n Radios with GaAs FET Power Amplifiers
n Fixed and Mobile radio transceivers
PRELIMINARY
Voltage
Regulator
Sine & square
wave drivers
CLKO
REGO
Bias Control
VPA
VBIAS
Baseband Controller
(e.g. MSM7730B)
Crystal
PDN
XOUT
XIN
PAEN
NEGEN
ICON
SINO
Crystal
Oscillator
VNEG
Negative voltage
generator
C1
C2
GaAs FET Power Amplifier
PA on/off switch
and current sense
ML2712
ML2713
Radio
ML2731


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